AC Infinity MULTIFAN S1, Quiet 80mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling

My last cable modem up and died after just one year, I'm pretty sure because it got so hot all the time. It was a modem+router so extra hotty-hot-hotness from all the circuitry packed into one case. My son thinks this is sort of normal lifespan for routers and modems - he expects only 3 to 4 years. Well I got 8 years out of one of my last modems and 10 out of the other (same modem, WTGS54 whatever that was, it was a very good modem for its time and I got more than enough throughput from it for my needs, including streaming video, I was still running one up until 2 years ago). So *I* was shocked at its short lifespan (especially given the cost, over $200) even if he wasn't. There is just more electronics involved in these tasks, packed into less space, than the older modems. They are GOING to get hot. So in order to keep that from happening again I bought this USB fan kit, comes with 2 fans hooked together, to replace the floor fan I had aimed at the new modem and separate router. I was getting some of these anyway to put on my LED grow lights to cool them (they will ALSO last longer if you keep them cool) so I took one of those and shoved it under the router (because its a flat design, give me vertical any day) and stood the other one up next to the cable modem (which is vertical). I've got them on low and they are cooling both devices very well. On low the router gets barely slightly warm, and the better design of the vertical case for the modem leaves it totally cooled down with this little fan. If I had it to do over I'd look harder for a vertical router as well, its easier to keep them cool. AND they take up a lot less space! I've got a bunch of old computer cases with fans going to waste, I will likely make some USB fans from all those old bits and pieces, but they are likely to be a lot louder. This fan is extremely quiet even on high. I can't hear it at all on low. Also these fans in particular are optimized for humid environments so I wouldn't use anything else in my grow room. A lot of people use the other dual fan kit with the larger fans but they are using them to move air over microgreens to cut down on mold and fungi, I don't have that problem, I just need to cool the lights to improve their longevity, so I'm trying these smaller fans (take up less headroom over the lights, giving me more space under the lights because I can move them further up). I highly recommend cooling your router/modem/game console whatever electronic devices you have sitting around generating heat with some kind of fan, and these are very quiet, easy to assemble (as in plug them in), and very effective. I've seen some people insist that you shouldn't do this because it might "blow dust into the case" - where do these guys live, in the middle of death valley? LOL! Just do it. I've had a floor fan blowing across my very very ancient laptop to keep it from overheating for about 5 years now (even laptop coolers can't cool it enough) and its still going strong. I can even play (very very old) games on it still. Heat will kill your devices WAY faster than whatever tiny specks of dust these fans probably won't blow into the cases anyway. Also, if you have one of those stupid refrigerator closet things where they've built an enclosure all the way around the fridge, that is trapping heat and shortening the life of your expensive stainless steel fridge - you can use these fans to draw hot air out of that too (though I'd go with the larger version for that). Personally I'd tear that crap out but failing that, install these in a side or back wall and pull that heat out of there. Your fridge will thank you. Your bank balance will be the better for it over the long haul.

Bought these during the summer when my internet started cutting out. Turned out my router and modem were overheating. Added these AC Infinity USB fans and the problem was immediately fixed. They’re quiet, move plenty of air, and I really like that they can be daisy-chained so multiple fans can run off one USB port (I daisy chained the 120 and 140 together and plugged them directly into my router). Setup was simple and clean. They’ve been running continuously for months with no issues. Solid, reliable, and absolutely worth it.

2/11/2021 UPDATE! Just reordered another S7 pair of fans! Andy, I have never met you, but I sure like these quiet fans and continue to recommend these! I have three of these fans in a media closet that is about the size of a tall refrigerator. Inside on shelves I have a high-powered AV receiver, a BluRay player, a Cable TV DVR, and other stuff that is producing an amazing amount of heat. When we built the house the wife wanted all AV equipment hidden, and as an Audiophile I wanted to be able to see what I want to see and hear what I want to hear in the Home theater seating area, but without any extraneous noise. Solution: I bought this item, and set two fans on top of the AV Receiver and a third identical fan on top of the cable box/DVR. Closed the door and waited an hour. Heat load dropped in half. I did not want to just move a hot air around in this large closet, so there is a passive vent installed in the sealing of the closet .... just a simple louvered floor vent like people have in their homes for floor heat. I just waited until the wife unit was out of the house and used one of her good steak knives to saw a hole in the drywall ceiling a drop this Lower cheap floor vent in:) Vacuum the mess up and done. These fans have been running flawlessly for two years now - and my wife, who could hear a mouse fart, has never noticed them. Quality/overall impression: Frankly, I thought these were two cheap to be really durable, but I bought them because at the time they were one of the few USB fan setups with a speed controller, no fan-boi disco light show LEDs, and with a CEC rating. The fans are very quiet, well-made, and have nice rubber anti-vibration feet. I was nervous about leaving cheap fans on 24-7 because the last thing I want to do is have a house fire because the units were wired up by orphaned slave labor recruited from a deplorable third world slum. But those fears were immediately put out of mind when I opened the box upon receipt. Beautiful packing, high quality wiring and fan construction. I am back on their site today reordering a second set to place on my desktop next to my computer workstation. I have a couple of good friends who work designing high end consumer electronics - the really pricy stuff. Both techs told me that placing a good quality cooling fan on an AV receiver can add several years working lifetime to such units. Therefore, I highly recommend these AC Infinity products. Just buy the dual fan setup, set the speed controller wherever you are comfortable and forget about them! (slower is a little quieter, but even on high these were very acceptable for my application) And like I said, I am back today repurchasing another set, which I should have done long ago:) Heat kills electronics. And if you are checking out cooling fans, you already know that stereos, AV equipment and computer gear can generate enough heat to slowly nuke your gear... Next possible project for these.... We have a couple of large walk in closets, which we keep the doors closed on because our ever-curious weenie dogs like to curl up in when we are not home. Anyway, I put the old computer fans, which were too noisy, in the closets to keep the air circulating and not smelling musty when we have been gone for awhile. One of these small fans would be much quieter, and would be strong enough to push all the air it needs to under the closet door to keep things smelling fresh in there - even after we have returned from a couple weeks vacation.

In June 2017 I purchased the MULTIFAN S3. I wanted an external fan that was extremely quiet, had an RPM adjustment switch, had vibration dampening feet or pads, and was USB-powered. The intended use was for cooling a vertical/upright Asus RT-AC56U/RT-AC56R router. The average temperature of those routers, with both 2.4GHz and 5GHz radios enabled, tends to be quite high (90C is common, especially during summertime). I also didn't want to void my router warranty modding it to support a fan (not to mention, small fans tend to be high RPM to make up for their size, thus loud -- no thanks!). The MULTIFAN S3 did exactly what I wanted. On medium speed, it's basically inaudible ~4 feet away. At medium speed, it lowered temperatures by about 10C, simply blowing air across the router from the side. The screenshot I've attached shows before-and-after; before, temperatures peaked at ~75C. With the MULTIFAN S3 in place, peaks hit 65C. Excellent for low-RPM, purely external cooling! I used this setup for about 9 months, until one day I began to hear a very quick and occasional "rattling" noise coming from somewhere near my networking equipment (all of which is fanless, excluding the MULTIFAN S3). This noise became more regular over the course of a few days, allowing me to track down the source: sure enough it was the MULTIFAN S3. Most likely the dual ball bearings were gradually loosening (shifting too much inside of their tract/sleeve), or possibly had developed "clotting" of bearing lubricant, both of which can happen with prolonged use. I disconnected the MULTIFAN S3 until earlier this week where summer temperatures were beginning to kick in again. Within an hour of hooking the fan back up, the "rattling" and "clicking" returned, no matter what speed the fan was set to. Bummer. I don't think I got a lemon, as it worked fine for many months. This problem with ball-bearing fans is common even with high-end PC case fans. It's one of the reasons I prefer Noctua oil pressure bearing (SSO/SSO2) fans, but Noctua doesn't make a product like the MULTIFAN S3 without use of third-party adapters. On the subject of fan bearings and lubricant: like most consumer fan products, the MULTIFAN S3 *does not* offer a convenient way to repair, replace, or re-oil the bearings, as there's a very firm plastic or aluminium company logo over the centre spindle on both sides of the fan. And even if there wasn't, many of these types of fans on the market have sealed plastic enclosures so you can't access them anyway, forcing you to buy a replacement. Overall I give this product 4/5 stars because it definitely does everything advertised and AC Infinity should be commended on their product. Just keep an ear out for any bearing problems.

**AC Infinity MULTIFAN S2** I placed this fan on top of my Xbox Series S to help with cooling. It's USB A and comes with a power block, a speed controller and rubber feet. I plugged it in to a WiFi outlet so I can turn it on remotely when I start playing, without having to reach behind the console. Installing it was easy, insert the rubber feet, plug it in, and set the speed. It has three speeds The lowest speed is very quiet and you can barely hear it. I use it on the middle speed, you can hear it if you are listening for it but after a few minutes it fades into the background. I'm not really sure if my Xbox needs it or not, but it does get warm, and it's narrow in my entertainment center. This fan blows the air out sideways, I turned it so it blows out the back where there's room for the heat to dissipate. When I'm using the Xbox, the air coming out of the fan is warm, which means it's functioning as expected. Cool is better than hot, I'll take it. So far so good. I would say it's a good value for the money.

I bought this fan for a new AV Receiver, but it did not work for my application. However, due to its size it makes a great USB fan for my desk. Using a 3D printer I was able to make a stand for it to sit at a slight upward angle and a cradle for the control. The fan throws just the right amount of air at me. Enough to gently feel it but not so much that it becomes annoying (even more so with the three speeds). Additionally, it is absolutely silent and the fact that it is USB powered makes it perfect for my home office. During hurricane season, if we lose power a rechargeable battery pack will run this thing forever. I have the S1 which is 3" x 3" or 80 mm.

I use two of these S2s on top of the One Connect Box for my Samsung TV. The Samsung box is in a media cabinet with good passive airflow but that box gets hot! Setting the speed to LOW or MEDIUM keeps the box much cooler. You can connect these fans together, then then plug them one into the USB port of the Samsung One Connect Box. They will turn on/off with the Samsung box. Play around with speed settings to find the optimal setting, as I believe the fan closest to the USB plug sets the actual speed and the fan furthest away has to be set on HIGH (per the user manual from the AC Infinity Website). Underneath my One Connect Box I have two AC Infinity Multifan S7 and then a Blu-ray player. The second image "Specifications" is confusing so I would ignore that. These are two S3 fans (dimensions 4.7" x 4.7" x 1"), 19dBA combined when set on LOW, 52 CFM EACH when set on HI. These fans ARE LINKED TOGETHER, you can not separate them, which is why they're sold as a Multifan system. If you're looking for separate fans in this size, get two of the S3s. These fans only have one speed controller that sets the speed for both of them. Since I have these wedged between two components and only the rubber feet are providing any extra space, LOW and MEDIUM are the only settings that don't cause a lot of air noise. I'm assuming the fans won't last super long since I'm using them in a way they weren't built for, but they're cheap so meh. This set up keeps my components cool with very little noise! I've had numerous AC Infinity fans over the years, the build quality is so good they last for a very long time. Always at the top of my list when looking for fans.

The AC Infinity 120mm fan is a solid & quiet cooling fan. I needed something to place either near or on top of my Firewalla Gold as it gets very hot at times and I wanted to see if something could be done to cool it down with zero noise. For $14 I decided to give this well-reviewed cooling fan a shot. Long story short, this fan works flawlessly. It checks all the boxes. Silent running. Multiple speeds (I keep mine on the lowest as that is all that is required to bring the Firewalla cooling fins down to room temp or lower). Inexpensive. I have a router right next to the Firewalla so just used the USB from that for power but any USB type A will do. I also purchased their 80mm dual fans as well and using those on a Comcast Cable X1 box that gets hot in my entertainment center. These help move the hot air out of the semi-enclosed space the box is in.